<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>选择器练习</title>
  <style>
    #l1{color: green}
    .c1{color: blue}
    h1,h2{background-color: yellow}
    input[type=password]{background-color: red}
    *{border: 2px solid red}
  </style>
</head>
<body>
<ul>
  <li id="l1">刘德华</li>
  <li class="c1">刘德华</li>
  <li>郭富城</li>
</ul>
<h1 class="c1">悟空</h1>
<h1>八戒</h1>
<h1>沙僧</h1>

<h2>虞姬</h2>
<input type="text"> <br>
<input type="password">

</body>
</html>